UBUNTU-CVE-2026-44393

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Source
https://ubuntu.com/security/CVE-2026-44393
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44393.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-44393
Upstream
  • CVE-2026-44393
Published
2026-06-04T16:16:00Z
Modified
2026-06-30T18:18:14Z
Severity
  • 7.4 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
  • 7.4 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

An issue was discovered in OpenStack oslo.messaging 1.0.0 through 17.3.0. The oslo.messaging RabbitMQ driver does not perform TLS hostname verification when connecting to the message broker. When ssl_ca_file is configured, the driver enables certificate chain validation but does not pass the expected broker hostname into the underlying TLS stack. Any certificate signed by the deployment CA is accepted regardless of hostname, allowing an attacker who can intercept control-plane traffic to impersonate the RabbitMQ broker and perform a man-in-the-middle attack on RPC and notification traffic. All OpenStack services using oslo.messaging with RabbitMQ over TLS are affected.

References

Affected packages

Ubuntu:16.04:LTS
python-oslo.messaging

Package

Name
python-oslo.messaging
Purl
pkg:deb/ubuntu/python-oslo.messaging?arch=source&distro=xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.5.0-1ubuntu1
3.*
3.0.0-1ubuntu2
4.*
4.5.0-1ubuntu1
4.5.1-1ubuntu1
4.6.1-2ubuntu1
4.6.1-2ubuntu2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "oslo-messaging-zmq-receiver",
            "binary_version": "4.6.1-2ubuntu2"
        },
        {
            "binary_name": "python-oslo-messaging",
            "binary_version": "4.6.1-2ubuntu2"
        },
        {
            "binary_name": "python-oslo.messaging",
            "binary_version": "4.6.1-2ubuntu2"
        },
        {
            "binary_name": "python3-oslo.messaging",
            "binary_version": "4.6.1-2ubuntu2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44393.json"
Ubuntu:18.04:LTS
python-oslo.messaging

Package

Name
python-oslo.messaging
Purl
pkg:deb/ubuntu/python-oslo.messaging?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

5.*
5.30.0-0ubuntu1
5.33.1-0ubuntu1
5.34.1-0ubuntu1
5.35.0-0ubuntu1
5.35.0-0ubuntu2
5.35.0-0ubuntu3
5.35.0-0ubuntu4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "oslo-messaging-zmq-receiver",
            "binary_version": "5.35.0-0ubuntu4"
        },
        {
            "binary_name": "python-oslo.messaging",
            "binary_version": "5.35.0-0ubuntu4"
        },
        {
            "binary_name": "python3-oslo.messaging",
            "binary_version": "5.35.0-0ubuntu4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44393.json"
Ubuntu:20.04:LTS
python-oslo.messaging

Package

Name
python-oslo.messaging
Purl
pkg:deb/ubuntu/python-oslo.messaging?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

9.*
9.7.1-0ubuntu3
10.*
10.4.0-0ubuntu2
10.5.0-0ubuntu1
11.*
11.0.0-0ubuntu1
12.*
12.1.0-0ubuntu1
12.1.6-0ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-oslo.messaging",
            "binary_version": "12.1.6-0ubuntu1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44393.json"
Ubuntu:22.04:LTS
python-oslo.messaging

Package

Name
python-oslo.messaging
Purl
pkg:deb/ubuntu/python-oslo.messaging?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

12.*
12.9.1-0ubuntu4
12.11.0-0ubuntu1
12.11.1-0ubuntu1
12.13.0-0ubuntu1
12.13.0-0ubuntu1.1
12.13.0-0ubuntu1.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-oslo.messaging",
            "binary_version": "12.13.0-0ubuntu1.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44393.json"
Ubuntu:24.04:LTS
python-oslo.messaging

Package

Name
python-oslo.messaging
Purl
pkg:deb/ubuntu/python-oslo.messaging?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

14.*
14.4.1-0ubuntu1
14.6.0-0ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-oslo.messaging",
            "binary_version": "14.6.0-0ubuntu1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44393.json"
Ubuntu:25.10
python-oslo.messaging

Package

Name
python-oslo.messaging
Purl
pkg:deb/ubuntu/python-oslo.messaging?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

16.*
16.1.0-0ubuntu1
17.*
17.1.0-0ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-oslo.messaging",
            "binary_version": "17.1.0-0ubuntu1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44393.json"
Ubuntu:26.04:LTS
python-oslo.messaging

Package

Name
python-oslo.messaging
Purl
pkg:deb/ubuntu/python-oslo.messaging?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

17.*
17.1.0-0ubuntu1
17.2.0-0ubuntu1
17.3.0-2ubuntu1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "python3-oslo.messaging",
            "binary_version": "17.3.0-2ubuntu1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-44393.json"